Dear all, I am trying to understand how channel commitment transactions can be revoked with op_checksigfromstack(msg, sig, key) and signed sequence commitments.
I understand that a commitment c(n, randomness) is signed by both parties for each state, and that this signature can be verified with op_csfs(c, sig(A+B), key(A+B)). The sequence n is incremented for each new state. Given the most recent commitment sequence signature (from both parties) and the sequence commitment opening (n++, r), an output script of an older, revoked commitment transaction can verify that a newer signed commitment sequence exists by examining: op_checksigfromstack(c++, sig(A+B), key(A+B)) c++ == commitment(n++, r) However, it must also have information about its own sequence number n, so it can verify that this is indeed lower than n++ (current). How is sequence number n committed to the nth commitment tx and accessible on-stack during script evaluation? I learned about this concept from Johnson Lao's and Roasbeef's Talk from Scaling Bitcoin at Stanford: https://scalingbitcoin.org/stanford2017/Day1/SB2017_script_2_0.pdf Any pointers would be very much appreciated. Kind regards, James
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